Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b71f73388e5b5d5…

MALICIOUS

PDF

86.2 KB Created: 2020-08-05 13:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a2fe0000c5fd70253bf878b9fb19ec SHA-1: 0d751e83a3d82854465b952287544297e7f216e9 SHA-256: 8b71f73388e5b5d5f1cf419680f363a8466c0dbc32a2a31ff25383d284db4803
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm designed to improve SEO and obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains text related to 'routing protocol pdf file' and the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=routing+protocol+pdf+file
    • http://files.yauponberrypress.com/uploads/1/3/1/6/131636806/64eeb1.pdf
    • http://files.biophilic.net/uploads/1/3/1/4/131453989/ragopimogu.pdf
    • http://files.livegentlewellness.com/uploads/1/3/0/9/130969695/1eed9559.pdf
    • http://files.torontowolverines.ca/uploads/1/3/0/7/130775921/9687790.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/jojasagozalumubutugosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/sevalejisapagumuso.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/dafopolelanuwut.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/55188631057.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/vofojusikezerujukejob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/nulolenumebogesisupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/16911956485.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/ligapozus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/92458815199.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/tigivudimexuwewuwawi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/bedenakejoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/74813283811.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/19690787429.pdf
    • https://cdn.shopify.com/s/files/1/0435/2924/0727/files/17988299017.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dde.bin
66f94044eb0ad8fce4ee255a1cf126b6da202abde2f07d1a472ee01def0e04f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 4940 bytes
font_01_sfnt_off00011ecc.bin
9319480952baaf7a4f1c9f98b4b2cd34b69a918a22461e1f774d7d8bfb201c23
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 14356 bytes